Surveillance of A(H1N1) influenza, new viral subtype in the State of São Paulo, 2009
Keywords:
influenza, epidemiology and control, case reporting and investigationAbstract
During April, 2009, a new viral subtype of the influenza A(H1N1 ) virus was identified in clinical specimens collected from two patients in the United States. The same viral strain was identified in Mexico, Canada and other parts of the world. This event was considered, by the World Health Organization (WHO) as a Public Health Emergency of international Concern. The present study describes the occurrence of notified influenza A(H1N1) cases of the new viral subtype, to the Epidemiologic Surveillance Center of the State of São Paulo, during the period comprised between April 22 to May 21, 2009, according to their distribution in time and space, as well as age groups and gender affected, finishing with the final case classification and criteria employed. A perfected surveillance was implemented, based on the Influenza Pandemic Preparedness Plan of the State of São Paulo, regarding timely identification and investigation of the cases. Respiratory samples were processed in the Instituto Adolfo Lutz, employing, as method of choice, real time chain polimerase reaction (rRT-PCR). A total of 87 reported cases, distributed, in the majority, in Greater São Paulo were concentrated in the age group of 20 to 49 year olds (70,1%), and coming from areas with confirmed cases of influenza A(H1N1). The most frequent symptoms were fever and cough (100%), and mialgia (70,1%); 40,2% were admitted to the hospital, all of them discharged with symptom remission. It is important to enhance the need to maintain the alert of the health systems regarding early detection and rapid response to cases and adoption of adequate prevention and control measures, as well as issuing information for both health professionals and the population regarding the present situation of this event.
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Copyright (c) 2009 João Fred, Gerrita Nogueira Figueira, Ricardo Mangabeira Albernaz, Alessandra Cristina Guedes Pellini, Ana Lúcia Frugis Yu , Terezinha Maria de Paiva, Ana Freitas Ribeiro, Telma Regina Marques Pinto Carvalhanas
This work is licensed under a Creative Commons Attribution 4.0 International License.
